AVR-Chat

I have successfully compiled the Atmel Butterfly demo program after converting
it from CodeVision to WinAVR(gcc) ... (at least I'm now at the point where I
just get warnings about 'char' types being used as array subscripts, etc. which
I'll address later).

I used AVRStudio to program the butterfly via JTAG with the Butterfly mounted on
an ECROS Technologies Butterfly carried board.

When I brought up AVRStudio and programmed the m169 I got the following from
AVRStudio:

...... start ..............
Loaded objectfile: C:\Documents and Settings\Charles Hackett\My Documents\AVR
Stuff\Butterfly\Copy of Demo Application Source\main.elf

JTAG ICE: Warning: Execution stopped on boot loader reset vector.

JTAG ICE: Warning: Boot reset fuses are programmed, but the program entry
function is located in the application section. Wrong boot reset fuses will
probably cause erronous execution.

JTAG ICE: Warning: If this is not an error, this check can be disabled in the
'Debug' section in the JTAG ICE options.
...... end ..............

The Atmel hex file was running fine before I tried my version.

Fuses are set as follows (to my knowledge these are 'as shipped'):
 
JTAGEN 			(JTAG Enable)
SPIEN				(SPI Enable)
BOOTSZ=00 			(4096 words)
BOOTRST			(Boot Reset vector enabled)
BODLEVEL=1			(Brownout 2.7v)
CKSEL=0010, SUT=10 	(2Mhz RC Osc.)

Lock Bits are set as follows (to my knowledge these are 'as shipped'):

Mode 1: No memory lock features enabled
Application Protection Mode 1: No lock on SPM and LPM in Application Section
Boot Loader Protection Mode 1: No lock on SPM and LPM in Boot Loader Section

I am only somewhat familiar with compiling for and loading an 'application' to
an AVR (ATMega16's and 128's).  I am not at all familiar with the intricacies of
boot loaders and would prefer to let that go for another day.

I have looked at the application code, and from what I can tell, the only 'boot'
stuff it has in it is a section of code that enables the Watchdog Timer and then
enters an infinite loop waiting for the AVR to be reset and (I assume) enter the
boot loader.

I thought that, since I'm compiling the Atmel demo, that all would be well and
that the application and boot loader would cooperate but I guess there is
something about this setup I don't understand.  So ...

Since I am currently loading the Butterfly using the JTAG interface can I
disable the boot loader but leave it in memory in case I want to use it later?  

To accomplish this do I just un-program the BOOTRST fuse?

On the other hand:  If I wanted to recover the memory for use in my application
how would I go about it and how do I restore the boot loader at a later time?

Thanks for your time in helping me along ...

Cheers,

Chuck Hackett
"Good judgment comes from experience, experience comes from bad judgment"
7.5" gauge Union Pacific Northern (4-8-4) 844
http://www.whitetrout.net/Chuck